Interpretation of Fetal Heart Tracings
VARIABILITY Fluctuations in baseline that are irregular in amplitude and frequency. Measured in a 10 minute window. Amplitude is measured peak to trough.
Finding -->
BASELINE RATE Mean bpm (rounded to 0 or 5) over a 10 minute interval, excluding periodic changes, periods of marked variability, and segments that differ by more than 25 bpm. The baseline must be identifiable for 2 minutes during the interval (but not necessarily a contiguous 2 minutes), otherwise it is considered indeterminate.
Finding --> bpm
ACCELERATION An abrupt (less than 30 seconds) increase in the fetal heart rate. Before 32 weeks gestation, accelerations should last 10 or more seconds and peak 10 or more bpm above baseline. After 32 weeks gestation, accelerations should last 15 or more seconds and peak 15 or more bpm above baseline. A prolonged acceleration is 2 or more minutes, but less than 10 minutes. An acceleration of 10 minutes or more is considered a change in baseline.
Finding --> accelerations
LATE DECELERATION A gradual (30+ seconds) decrease and return to baseline of the fetal heart rate associated with a uterine contraction. The nadir of the deceleration occurs after the peak of the contraction.
Finding --> late decelerations
EARLY DECELERATION A gradual (30+ seconds) decrease and return to baseline of the fetal heart rate associated with a uterine contraction. The nadir of the deceleration and the peak of the contraction occur at the same time.
Finding --> early decelerations
VARIABLE DECELERATION An abrupt (less than 30 seconds) decrease in the fetal heart rate below the baseline. The decrease is at least 15 bpm lasting between 15 seconds and 2 minutes from onset to return to baseline.
Finding --> variable decelerations
CONTRACTIONS
Finding -->
Frequency --> Every minutes
Rhythm -->
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INTERPRETATION -->
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